282 



Report of the Committee on Colour-Vision. 



3. That the testing should be entrusted to examiners certifi- 



cated by the central authority. 



4. That the test for colour-vision should be that of Holmgren, 



the sets of, wools being approved by the central authority 

 before use, especially as to the correctness of the three 

 test colours, and also of the confusion colours. If the 

 test be satisfactorily passed, it should be followed by the 

 candidate being required to name without hesitation the 

 colours which are employed as signals or lights, and also 

 white light. 



5. That the tests for form should be those of Snellen, and that 



they should be carried out as laid down in Appendix 

 VI. It would probably, in most cases, suffice if half nor- 

 mal vision in each eye were required. 



6. That a candidate rejected for any of the specified employ- 



ments should have a right of appeal to an expert approved 

 by the central authority, whose decision should be final. 



7. That a candidate who is rejected for naming colours 



wrongly, but who has been proved to possess normal 

 colour- vision, should be allowed to be re-examined after a 

 proper interval of time. 



8. That a certificate of the candidate's colour-vision and form- 



vision according to the appointed tests, and his capacity 

 for naming the signal colours, should be given by the 

 examiner ; and that a schedule of persons examined, 

 showing the results, together with the nature of the 

 employments for which examinations were held, should be 

 sent annually to the central authority. 



9. That every third year, or oftener, persons filling the 



scheduled employments should be examined for form- 

 vision. 



10. That the tests in use, and the mode of conducting examina- 



tions at the different testing stations, should be inspected 

 periodically by a scientific expert, appointed for that 

 purpose by the central authority. 



11. That the colours used for lights on board ship, and for lamp 



signals on railways, should, so far as possible, be uniform, 

 and that glasses of the same colour as the green and red 

 sealed pattern glasses of the Royal Navy, should be 

 generally adopted. 



12. That in case of judicial inquiries as to collisions or accidents,. 



witnesses giving evidence as to the nature or position of 

 coloured signals or lights should be themselves tested 

 for colour- and form-vision. 



April 28 ; 1892. 



(Signed) Rayleigh, 



Chairman. 



